Galileo's Theory of Reality

Before galileo, following aristotle, people thought the world was filled with qualities. The problem is you can't capture these kind of qualities in a purely quantitative vocabulary. This was a problem for galileo's aspiration to exhaustively describe the physical world in mathematics. So what he had to do was to propose a radically new philosophical theory of reality. According to this theory, the qualities aren't really out there in the physical world, rather there in the consciousness of the observer....